Thank you, I could partition my external dd 32 fat as I wanted. thank you. My second problem was not resolved. please provide a solution for protected by a password partition on my external dd.
Thank you in advance

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You need a truecrypt, you can download it from the official site, it encrypt the entire hard disk so when a thief tried to get access to the device all windows will report is: the drive is unformated, do you want to format the drive to access it ?
Truecrypt is a free open source solution, allowing you to encrypt your hard drive with AES. You can unlock it on demand and get a transparent access to the data though all data stays all the time fully encrypted on that drive.